AH-4 Antenna Tuner Outline 1
• The AH-4 matches the IC-746PRO to a long wire
antenna more than 7 m/23 ft long (3.5 MHz and above).
– NEVER operate the AH-4 without an antenna wire. The
tuner and transceiver will be damaged.
– NEVER operate the AH-4 when it is not grounded.
– Transmitting before tuning may damage the transceiver.
• Note that the AH-4 cannot tune when using a 1.2 l long
wire or multiple of the operating frequency.
• When connecting the AH-4, the antenna connector
assignments are [ANT2] for the internal tuner and
[ANT1] for the AH-4. The antenna indicator in the LCD
displays “EXT” when the AH-4 is connected and
selected.
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